Step 1: Create VCR by District (Choose a map visual)
a. Latitude = Lat of District, Longitude = Lat of Longitude, Size = Violent Crime Rate, Tooltips = Major Crime Rate.
b. Selecting formatting, in general X position = 151, Y position = 372, Width = 577, Height = 289
c. Data Colors formatted by field value, Color Measure
d. Title, VCR by District, Color = black, text size = 12, background = light gray, alignment = center, font = Constantia
e. Border = dark gray
Here is a simple tutorial on how to build a Bing Map Visual.